SOLUTION: z^2+9=10z and n^2+n=72

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Question 77400: z^2+9=10z
and
n^2+n=72
Answer by stanbon(57299) About Me  (Show Source):
You can put this solution on YOUR website!

z^2+9=10z
z^2-10z+9=0
(z-9)(z-1)=0
z=9 or z=1
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and
n^2+n=72
n^2+n-72=0
(n+9)(n-8)=0
n=-9 or n=8
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Cheers,
Stan H.